Cyberdramon

Effect

[When Digivolving] You may play 1 [Ryo Akiyama] from your hand without paying its memory cost. [Your Turn] While you have no Tamers in play, this Digimon can't attack players.

Source Effect

[When Attacking] [Once Per Turn] If you have 2 or more black Tamers in play, ＜De-Digivolve 1＞ 1 of your opponent's Digimon. (Trash the top card. You can't trash past level 3 cards.)